Revisiting the maxillary subperiosteal implant prosthesis : A case study

Revisiting the Maxillary Subperiosteal Implant Prosthesis: A Case Study

1. Scientific Reference

• Study Title: Revisiting the Maxillary Subperiosteal Implant Prosthesis: A Case Study
• Authors: Mohd Adnan Mapkar, Ruby Syed
• Journal: Journal of Dental Implants
• Year of Publication: 2015
• DOI: 10.4103/0974-6781.190434

2. Scientific Background

Management of patients with severe alveolar bone resorption remains one of the most demanding challenges in implant dentistry and oral rehabilitation. In cases of advanced maxillary atrophy, the available bone volume may be insufficient for conventional endosseous implant placement without extensive augmentation procedures.

Before the widespread adoption of osseointegrated root-form implants, subperiosteal implants represented an established treatment option for edentulous patients with limited residual bone. However, the remarkable success of endosseous implant systems led to a substantial decline in their use over recent decades.

This article revisits the potential role of subperiosteal implants in contemporary implantology. By combining a literature overview with a clinical case presentation, the authors explore whether this historically important treatment modality may still offer value in carefully selected patients who are not suitable candidates for conventional implant placement. The study contributes to the ongoing discussion regarding treatment alternatives for severe maxillary atrophy and complex implant rehabilitation.

3. Study Objective

The primary objective of this publication was to review the clinical relevance of subperiosteal implants and to illustrate their potential application through a maxillary rehabilitation case.

The authors sought to demonstrate how a customized maxillary subperiosteal implant could be used in a patient presenting with significant bone loss, where conventional endosseous implant therapy was considered unsuitable based on anatomical limitations.

4. Methodology

This publication is a single-patient case report.

The patient was a 21-year-old male who had lost several maxillary and mandibular teeth following trauma approximately six to seven years earlier. Clinical examination and radiographic assessment revealed significant resorption of the partially edentulous alveolar ridges.

Computed tomography imaging demonstrated anatomical constraints, including reduced bone dimensions and proximity of the maxillary sinus, leading the clinicians to exclude endosseous implant placement in the maxilla.

A two-stage subperiosteal implant protocol was performed. During the first surgical procedure, a direct impression of the maxillary bone was obtained. This impression was used to fabricate a custom-designed subperiosteal framework and prosthetic superstructure. Approximately eight weeks later, a second surgical intervention was carried out to place and secure the implant using titanium screws before delivery of the definitive prosthesis.

Several methodological details, including standardized outcome measures and long-term follow-up duration, were not specified in the article.

5. Main Findings

The customized maxillary subperiosteal implant was successfully fabricated and surgically installed according to the planned treatment protocol.

Following prosthetic delivery, the patient reported satisfaction with both retention and stability of the prosthesis. According to the authors, the rehabilitation also achieved favorable functional and esthetic outcomes.

The article does not provide quantitative measurements related to implant survival, biological complications, mechanical complications, patient-reported outcome scores, or long-term performance of the restoration.

In addition to the presented case, the authors reviewed historical literature describing variable success rates for subperiosteal implants. While some reports documented relatively modest long-term outcomes, others suggested that well-designed subperiosteal implants could remain functional for extended periods when appropriate surgical and prosthetic principles were followed.

The publication therefore presents the case as an illustration of clinical feasibility rather than as evidence of predictable long-term success.

6. Clinical Analysis

The most important contribution of this case report is its reminder that implant rehabilitation options extend beyond conventional endosseous implants. Although modern implant dentistry is largely centered on osseointegrated root-form implants, certain anatomical situations continue to challenge established treatment protocols.

The presented patient exhibited significant maxillary bone deficiency, limiting the possibility of conventional implant placement. Within this context, the subperiosteal implant served as a customized solution adapted to the patient’s residual anatomy rather than relying on available bone volume for implant anchorage.

From a clinical perspective, the report highlights the importance of individualized treatment planning in patients with severe alveolar atrophy. It also emphasizes factors that have historically been associated with successful subperiosteal implant therapy, including precise implant design, atraumatic surgical execution, accurate impression procedures, anatomical understanding, and appropriate prosthetic management.

However, the findings should not be interpreted as proof of superiority or equivalence compared with contemporary implant therapies. A favorable outcome in a single patient cannot establish predictability across broader patient populations. Furthermore, the lack of long-term follow-up data limits the ability to assess biological stability, prosthetic longevity, or complication rates.

Consequently, the report should be viewed primarily as a demonstration of an alternative treatment approach rather than definitive clinical evidence.

7. Clinical Applications

The findings presented in this article may be relevant in selected clinical scenarios involving:

• Severe maxillary bone atrophy.
• Patients with insufficient bone volume for conventional endosseous implants.
• Situations where extensive bone grafting procedures may be undesirable or difficult to perform.
• Complex implant rehabilitation requiring customized prosthetic support.
• Partially or completely edentulous patients with significant anatomical limitations.

The article does not provide evidence supporting routine use of subperiosteal implants and should not be interpreted as a recommendation for widespread clinical adoption. Rather, it suggests a potential role for this approach in carefully selected cases.

8. Level of Evidence, Limitations, and Transparency

This publication represents a case report, which corresponds to a low level of clinical evidence.

Its principal limitation is the inclusion of only one patient without a control group, comparative analysis, or statistical evaluation. The absence of standardized outcome measurements and long-term follow-up data further restricts the strength of the conclusions.

Although the authors discuss previously published literature, the article does not constitute a systematic review and therefore cannot provide comprehensive evidence regarding treatment effectiveness.

Regarding transparency, the authors reported no conflicts of interest and stated that no financial support was received for the study. Patient consent for publication of clinical information and photographs was also documented.

9. Key Study Points

• Study Type: Clinical case report.
• Level of Evidence: Low.
• Population Evaluated: One patient.
• Number of Patients or Implants: One patient; exact number of implants not specified in the provided article.
• Follow-up Duration: Not specified in the provided article.
• Primary Outcome Evaluated: Rehabilitation of a severely resorbed maxilla using a customized subperiosteal implant.
• Main Finding: Successful prosthetic rehabilitation with satisfactory retention and stability reported by the patient and clinicians.
• Scientific Conclusion: Subperiosteal implants may remain a treatment option in selected cases where endosseous implant placement is not feasible.
• Potential Limitations: Single-patient design, absence of comparative data, lack of long-term follow-up, and limited quantitative outcomes.

10. Scientific Impact

This publication contributes to the implant dentistry literature by revisiting a treatment modality that has largely been overshadowed by modern osseointegrated implant systems.

Rather than introducing new clinical evidence, the article serves as a reminder that subperiosteal implants may still have a role in highly specific anatomical situations. The case illustrates how customized implant frameworks can be used to address severe maxillary atrophy when conventional treatment pathways are limited.

The study also reflects broader developments in implant rehabilitation, including the use of advanced imaging and patient-specific implant design. While the evidence presented is insufficient to support broad clinical recommendations, it encourages further investigation into alternative rehabilitation strategies for patients with severe bone deficiency.

As such, the article contributes more to clinical discussion and historical perspective than to definitive evidence-based treatment guidance.

11. Editorial Conclusion

This case report revisits the clinical use of maxillary subperiosteal implants in a patient with severe alveolar bone resorption that precluded conventional endosseous implant placement. Although limited by its single-patient design and lack of long-term outcome data, the publication highlights a potentially valuable treatment alternative for carefully selected cases. The report reinforces the importance of individualized treatment planning and supports continued research into implant solutions for patients with advanced maxillary atrophy and complex rehabilitation needs.